Meiosis in Solanum phureja

Abstract

Meiosis and pollen mitosis were studied in a clone of Solanumphureja in order to elucidate the generally high frequency (about 90 yo) of tetraploid progeny in tetraploid X diploid crosses involving S. phureja.The first meiotic division was normal with 12 bivalents in metaphase and apparently normal chromosome disjunction. The second meiotic division showed normal metaphases with 12 chromosomes in each of the two spindles, along with cells showing a bi-or tripolar spindle (cell wall formation was simultaneous). At the end of the second division those disturbances resulted in unreduced cells either with two diploid nuclei or with one diploid and two haploid nuclei along with the normal tetrads with four haploid nuclei.The frequency of unreduced gametes was about 50 %. First and second pollen mitoses were

CONTROL GENÉTICO DE LA PRODUCCIÓN DE POLEN 2n POR "HUSOS PARALELOS" EN PAPAS DIPLOIDES

“…Existe aún controversia entre diferentes investigadores con respecto a la relación entre la presencia de anormalidades en los husos y la existencia de disturbios meióticos (15,6,8,13,17). Mok y Peloquin ( 13) y Veilleux y col. (19) han sugerido que "husos paralelos", "husos fusionados" y "husos tripolares" (que dan como resultado una tríada de dos microsporos n y uno 2n) podrían simplemente representar niveles de intensidad en la expresión de un mismo carácter.…”

Morphological and anatomical characterization of yellow diploid potato flower for effective breeding program

“…There are studies on microsporogenesis 16 and pollen meiosis and mitosis in S. tuberosum 30 . However, the different species and cultivars may present developmental particularities, which justifies the need for further research input on this subject 31 .…”